Note that by using suitable resistors any potential intermediate
between those given by the terminals of the battery can be obtained.
For instance, if the lower and upper ends of the battery in Fig. 2.11
are regarded as 0 and + 40 (they could equally be reckoned as - 40
and 0, or - 10 and + 30, with respect to any selected level of voltage),
the potential of the junction between R
3
and R
4
is 14.21 V. The
arrrangement is therefore called a potential divider,
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